Draft device of a spinning machine



April 12, 1960 -NAOJl ARAKAWA 2,932,067

DRAFT DEVICE OF A SPINNINGMACHINE Filed May 6, 1955 NAOJI ARAKAWA {f WM,

Attgi INVENTOR 7 2,932,067 DRAFT DEVICE OF A SPINNING MACHIN E I Naoji Arakawa, Toyonaka, Japan 7 Application May 6, 1955, Serial No. 506,642

In Japan April 5, 1947 Public Law 619, August 23, 1954 Patent expires April 5, 1967 8 Claims. c1. 19-151 This invention relates to the draft device of a spinning machine, and more particularly to the cradle for draft rollers. An object'of this. invention is to provide in a draft device a cradle for rollers, whereby Working pressure can be applied to 'or removed from the rollers for each spindle simultaneously bya single operation. Another object is to provide a safety means to automatically release the top cradle from the bottom one when a sliver abnormally winds on the roller, so that the cradle can be protected from any deformation or destruction.

In the accompanying drawing, Fig. 1 is a-jside elevation of the roller part according to this invention, and Figs. 2 to 7 are side and plan views of three pieces which constitute the cradle. Referring to the drawing, 1 is a so that the rollers on the top cradle are loaded simul taneously. The front arms of the L-shape levers extend forward and rest on the front piece at its end in its working condition.

In operation, as the top cradle is held at its position on one point, that is the projection 21, the load acting on the top cradle owing to the elasticity of the spring 25, is

divided between the rollers 14 and 16 according to the I ratio of the distance from the projection, and the .working pressure at the rollers will be maintained constant.

In case a .sliver abnormally winds on the roller 6, the front piece 9 is raised against the action 'of the spring 13 by the wound sliver through the top roller, so that the L-shape lever 22 turns on the pin 23, and the hooked end 24 is disengaged from this projection 21, releasing the top cradle from the bottom one.

part of a roller-stand secured to the machine frame. n J

the roller stand are adjustably fixed bearing blocks 2 and 3, on which bottom rollers 4, 5 and 6 are mounted. The numeral 7 is a bar fixed to the roller stand, and a bottom cradle 8 is secured to the bar by a bolt. Top and bottom cradles are independently employed for each spindle.

'The top cradle consists of two pieces, a front piece 9 and a rear piece 10, and they are hinged by loose rivets 11. The rear piece consists of two. side plates which are connected together by stays 12 as shown in Figs. 4 and 5. A spring 13 is inserted between the rear end of the front piece and the front end of the rear one, and the pieces are normally under the influence of the spring. Spring 13"urges' front piece 9 around pivot 11 in a counterclockwise direction, thus tirging roller 16 downwardly against roller 6. The reaction force from roller 6 acts upwardly through roller 16 and the part 22. This causes an up-. ward force on the rear piece tending to rotate it clockwise around pivot 21. This in turn causes roller 14 to press down on roller 4; thereby the top rollers 14 and 16 held on the pieces press the corresponding bottom rollers 4 and 6. The numerals 4--14, 515 and 616 are bottom and top rollers of back, middle and front rollers, respectively.

The middle top roller is held on the rear piece. The numerals 17 and 18 are top and bottom tensers, and 19 and 20 are leather bands extending between the middle rollers and the tensers. The reference character 21 is a projection on each side of-the bottom cradle. The numeral 22 is an L-shape lever provided on each side of the top cradle, and is pivoted on the side of the rear piece by a loose rivet 23.

Along the inside of each side plate is provided a spring 25 which presses down the arbors ends of the middle top roller 15 against the bottom roller 5. The reaction of the springs tends to rock the top cradle clockwise around the projection 21, so that the top rollers 14 and 16 respectively press the bottom rollers 4 and 6. The springs 25 on both sides may be connected in one piece along the stay 12'.

The top cradle can be engaged with the bottom one by fitting a recess provided at its lower edge on the projection 21 of the bottom cradle, and inserting the hooked end 24 of the lever beneath the projection 21,

In case a sliver abnormally winds on the back bottom roller 4, the back end of the rear piece 10 is raised by the wound sliver through the roller 14, so that the rear,

piece 10 including the pin 23 is turned a little around the projection 21, but as the front end of the L-shape lever is restricted in its position by the front piece, the

hooked end 24 is compelled to get out from its position I under the projection 21, and the top cradle is disengaged from the bottom one. By1this means, the cradle can be 1 kept safe from any trouble which may be caused due to abnormal winding of a sliveron the rollers.

The top cradle can be disengaged from the bottomone by turning the L-shape lever on the pin 23 so as to bring out the hooked end from the working position beneath the projection 21.

1 which are secured to the front and rear pieces by set screws 28 and 29, respectively.

in that case the rear piece is shortened.

What I claim is:

1. A draft device for a spinning machine comprising in combination a bearing blockhaving a plurality of rollers therein, a bottom cradle on said bearing block, a. projection on each side of said bottom cradle forming.

a single pivot, and a top cradle comprising a rear piece having a roller mounted thereon opposed to a roller on said bearing block and spring means between said rear.

piece and the roller mounted thereon urging saidroller against the roller on said bearing block, said rear piecej further having slots therein slidable on said projections fold together with the pivotal connection being urged upwardly, and a pair of L-shaped levers, one on each side of said rear piece and connected to each other, said levers being pivoted at the bend therein to said rear piece and each having one leg extending forward and bearing on said front piece adjacent the roller thereon and having the other leg extending downward and terminating in a'hook engaging under the projections on said bottom cradle.

2. A draft device as claimed in claim 1 and said rear piece being extended and having a roller thereon opposed to aroller on said bearing block, the downwardly ex-' tending leg on said L-shaped levers being of such a. length that when the hook is engaged under the projections on said bottom cradle all three rollers on said upper grad: bear against the opposed rollers on said bearing.

3. A draft device for a spinning machine comprising a bottom cradle with a single pivot means thereon, and;

a top cradle having two pieces pivoted to each other,.

Patented Apr. 12, 1960 In this invention, the back roller may be eliminated from the rear piece, and

one ofisaiddwor pieees .-being'- '-pivoted on said single pivot means and-- the others piece -being spring loaded with" re,-

spect to said one piece, and, hook means holding said top cradle to said pivot means and actuated to the inoperative position by"movementofi one ofsaid cradle pieces away from saidbottom cradle. l

4; A draft device for attachmentltoa spinning frameg having a plurality of rollers thereon, said draft-device:

comprising abottom cradlefmember halvinga single-pivot thereon, saidbottornf cradle "member being attached to said frame with said pivot on. said cradle member. ad-; jacent one of said rollers on said frame, and a top cra-I dle mounted on ,said single .pivot for pivotal movement around-saidsingle pivot and sliding-movementtrans:

versely of the axisofsaid single pivot andihavingsati leastioiie, roller 2 'rotatablyfspring,mounted therein, said.

roller being spaced to,oppo'se a, roller on-said frame, and hook means pivoted to said top cradle for engagementunder saidpivotIonlsaidbottom cradle,membe'r, saidxu hook means being of a size such that whendt-isengaged under said pivot on said bottom cradle member said spring mounted rollerv in said top cradle is under spring loading against a roller on the spinning framei "5.- Adraft device for attachment to a spinning frame having-a plurality of rollers thereon, said :draftfidevice comprising a bottom cradle member-having a single pivot. thereom said bottom cradle member being attached to said, frame with said pivot on said cradle member adjacent one of said rollers on said frame, and a top cradle mounted on said single pivot for pivotal movementaround said single pivot and sliding movement transv versely of the axis of said single pivot and having at least one roller rotatably spring-mounted therein, said roller beingspaced to oppose aroller on said frame, and an L-shaped lever member having two arms, oneon'. each sideof said, top cradle, forming one leg of the L,

said arms each having a hook on theend thereof, said lever memberpivoted at the elbow to said top cradle for engagement of said hooks ;under said pivot on said bottom cradle member, the arms :with said hooks thereon being of a length such that when said hooks are engaged under said pivot on said bottom cradle member said spr'ingmountedroller in said top cradle is under spring loading against a roller on the-spinning frame, and the other leg of said lever member lies against said topcradle';

6. A draft devicevfor attachment to a spinning frame having a pluralityof rollers thereon one of which has an apron therearound, said draft-device comprising a bottomcradle member having a single pivot thereon, said spacer barremovably mounted in said topcradle, an

apron around said roller and said spacer bar, said roller being spaced to oppose the roller on said frame with the apron therearound, and two connected L-shaped levers, one of the arms of each lever having a hook on the. end thereof, said levers pivoted at the elbows thereof to said'top cradle for engagement of said hooks undersaid pivotonsaid bottom cradle member, thearms with said hooks thereon beingof a length suchthat when said hooks are engaged under said pivot on said bottom cra:

die member said spring mounted rollerin said top cradleis-vunder spring loading against a roller on the spinning two pieces pivoted toeachother, one of said -two pieces being mountedon said single pivot for pivotal movement around said; single pi.v'ot. andslidi'ng movement transversely of the axiseofsaid'isinglepivot, said one piece having atleast one when rotatablyspring mounted therein and the other-piecebeinguspring; loaded with respect to said one piece to pivot the free end of said other piece toward thefspi'nning-frame,-'and said other piece having a roller rotatably mounted therein, said rollers being spaced to oppose rollers on said frame, andhook 'means pivoted to said one piece for engagement undfi f.

saidpivot on said bottom c'radlemember, said'hoolgij means beingof 'asize such that when it is'engaged under said-pivot onlsaid bottorn cradle member saidspring mountedroller in said one piece of saidtop ,cradlejsj under spring loading againsta roller on the spinning name;

A draft device for attachmentto a spinning frame-' having, a plurality of'rollers thereon one of which has" an apron ,therearound, said draft device comprisingpa" bottom cradlemember having a single pivot thereon said bottom. cradle member beingattached to said frame, withsaid pivot onsaid cradlelmember adjacent one'ofj said rollers, and a top cradle comprising two pieces ply} oted to each other, one of. said two pieces-being mount i ed on said single pivot for pivotal movement around said; single pivot and sliding movement transversely offthcf axis of said single pivot, said one piece having aroller' rotatably spring mounted therein, a spacer bar on said one piece, an apron around said roller and said spacer bar, and the other piece being spring loaded with respect to Jsaidone piece to pivot the free end of said otherpie'ce; toward the spinning frame, and said other piece having a roller rotatably mounted therein, said rollers being spaced to oppose rollers on said frame, and two con nectedL-shaped levers oneof the armsjon each lever having a hook on the end thereof, said lever pivoted at the elbows to said one piece for engagement of said; hooks under said pivot on said bottom cradle member, the arms with said hooks thereon being of a length such that when they are engaged under said pivot on said bot tom cradle member said spring mounted roller and the apron therearound in said one piece of said top cradle is under spring loading against the roller with the apron? therearound on the spinning frame, the other armspn; said levers lying against said otherpiece when said hooks, are engaged, whereby when said other piece .is raisedf against the spring loading, it bears against the other arms ofsaid levers and pivots said levers, thereby disengaging said hooks.

France June 6, ll-,: 

